ok, received my payment request for shopmate....

Base charge:$24.95
Weight charge:$35.70
Voucher discount:- $12.13

As you can see, clearly not the cheapest option out there & needless to say that I won't be partaking in an experiment like this any time soon

Australia Post are charging me for:
Package value: 2.9kg

When UPS Ground have it listed in their systems at
PackageWeight:2.20 lbs. that's roughly 1kg.

In short, my items were going to cost $60 to ship, but using the supplied promotional code i "saved" $12.
Ive emailed them my query in regards to the amount charged. Now to wait until the package arrives and chase up the difference in shipping weight costs. Joy.